The list is the FIPS codes of Iowa counties. All the FIPS codes are starting with 19.
| County | FIPS Code |
| Adair | 19001 |
| Adams | 19003 |
| Allamakee | 19005 |
| Appanoose | 19007 |
| Audubon | 19009 |
| Benton | 19011 |
| Black Hawk | 19013 |
| Boone | 19015 |
| Bremer | 19017 |
| Buchanan | 19019 |
| Buena Vista | 19021 |
| Butler | 19023 |
| Calhoun | 19025 |
| Carroll | 19027 |
| Cass | 19029 |
| Cedar | 19031 |
| Cerro Gordo | 19033 |
| Cherokee | 19035 |
| Chickasaw | 19037 |
| Clarke | 19039 |
| Clay | 19041 |
| Clayton | 19043 |
| Clinton | 19045 |
| Crawford | 19047 |
| Dallas | 19049 |
| Davis | 19051 |
| Decatur | 19053 |
| Delaware | 19055 |
| Des Moines | 19057 |
| Dickinson | 19059 |
| Dubuque | 19061 |
| Emmet | 19063 |
| Fayette | 19065 |
| Floyd | 19067 |
| Franklin | 19069 |
| Fremont | 19071 |
| Greene | 19073 |
| Grundy | 19075 |
| Guthrie | 19077 |
| Hamilton | 19079 |
| Hancock | 19081 |
| Hardin | 19083 |
| Harrison | 19085 |
| Henry | 19087 |
| Howard | 19089 |
| Humboldt | 19091 |
| Ida | 19093 |
| Iowa | 19095 |
| Jackson | 19097 |
| Jasper | 19099 |
| Jefferson | 19101 |
| Johnson | 19103 |
| Jones | 19105 |
| Keokuk | 19107 |
| Kossuth | 19109 |
| Lee | 19111 |
| Linn | 19113 |
| Louisa | 19115 |
| Lucas | 19117 |
| Lyon | 19119 |
| Madison | 19121 |
| Mahaska | 19123 |
| Marion | 19125 |
| Marshall | 19127 |
| Mills | 19129 |
| Mitchell | 19131 |
| Monona | 19133 |
| Monroe | 19135 |
| Montgomery | 19137 |
| Muscatine | 19139 |
| O Brien | 19141 |
| Osceola | 19143 |
| Page | 19145 |
| Palo Alto | 19147 |
| Plymouth | 19149 |
| Pocahontas | 19151 |
| Polk | 19153 |
| Pottawattamie | 19155 |
| Poweshiek | 19157 |
| Ringgold | 19159 |
| Sac | 19161 |
| Scott | 19163 |
| Shelby | 19165 |
| Sioux | 19167 |
| Story | 19169 |
| Tama | 19171 |
| Taylor | 19173 |
| Union | 19175 |
| Van Buren | 19177 |
| Wapello | 19179 |
| Warren | 19181 |
| Washington | 19183 |
| Wayne | 19185 |
| Webster | 19187 |
| Winnebago | 19189 |
| Winneshiek | 19191 |
| Woodbury | 19193 |
| Worth | 19195 |
| Wright | 19197 |
All codes are cited from United States Department of Agriculture [28].